Mai mult din curiozitate dar si pentru a afla cu exactitate ce filtre detine dotarea standard a transceiverului Kenwood TS 850s AT pe care-l detin m-am apucat de facut “sapaturi” folosind vasta sursa de informatie pe care ne-o ofera Internetul.
Din cautare in cautare am dat peste “Kenwood TS 850s Service Manual and Notes” versiunea PDF, thanks God ca mai sunt unii care digitalizeaza asemenea documente si le pun la dispozitie si altor interesati (a se vedea si proiectul Restitutio initiat de SRR).
Rasfoind manualul am dat exact peste informatia pe care o cautam. La pagina 12 se dau caracteristicile filtrelor ce se gasesc in dotarea standard a rig-ului (click pe imaginea de mai sus pentru versiunea intr-o rezolutie mai mare).
Voi spicui din acele tabele sectiunea ce m-a interesat, adica Pass Bandwidth, Nominal center frequency precum si tipul filtrului (XF- Cristal , CF – Filtru Ceramic).
Continue reading Kenwood TS 850s si largimea de banda
With some help from Marius YO3HYR, I finally manage to connect the Kenwood TS850s AT to the computer on the CAT interface and also as a digital mode. Above you can see some photos of the wonderful work of YO3HYR interface.
Interfete CAT / Moduri Digitale pentru transceiverele ICOM, Kenwood, Yaesu pot fi comandate prin intermediul HamShop sau direct la YO3HYR.
Another Kenwood TS-850s board (PLL Unit) with brand new electrolytic capacitors. Overall 96 capacitors replaced until now, TS-850s got 113 so there are 17 old ones that has to be changed on 2 more boards left, one is the output power unit and the second is the digital board.
Another Kenwood TS-850s board (RF Unit) with brand new electrolytic capacitors.
Yesterday, after 5 hours of work, I manage to replace over 40 electrolytic capacitors on one of the IF Unit boards and on the power distribution board. Below you can see some pictures from the first step of a complete electrolytic capacitor replace on the Kenwood TS-850s and above a happy Kenwood meal. 😀
Everybody knows the fact that Kenwood TS850s is a great transceiver but unfortunately at the-same time this rig is at least 13 years old.
One of the electronic component type that has problem with age are the electrolytic capacitors contained in the transceiver. By the passing of time, due to leakage, electrical stress or heat exposure the characteristic value of those components can be changed.
To obtain the best result, and prolong the transceiver life I guess is a good idea to replace all the electrolytic capacitors inside my TS850s.
According to an eBay post, there are 113 small electrolytic capacitors used in the TS850s. The price (39USD) is a bit high so I’ll acquire them from a local electronic part store.
So, we need:
Continue reading Kenwood TS850s complete electrolytic capacitor replace
Today I’ve made some carrier set point adjustments on my Kenwood TS850s so that I’ll have the-same audio tone on LSB and USB according to my voice.
1. First of all, open the little hatch on the top of the radio (on the place where DRU-2 unit and filter dip switch are located. Click on the image above for hi-res version).
2. Plug the original Kenwood microphone ( I use the MC43 hand mike). Locate VR501 (LSB) , VR502 (USB), VR503 (Balance Audio Tone).
3. Set the frequency on 14.200 Khz.
4. Turn the radio OFF and after that turn it ON while pressing also the F.Lock button.
5. A menu will be displayed. While rotating the M.CH/VFO.CH knob make sure that menu 00 (zero zero) is displayed.
6. Use a pair of headphones with the transceiver and push the Moni button while adjusting the Moni knob for the right volume without getting mike feedback, hi.
Continue reading Kenwood TS-850s Carrier set point adjustments
Kenwood TS850s Remote Connector Pinouts, solder side view.
1- Loudspeaker Output
2- RX-TX Relay Common
Continue reading Kenwood TS850s Remote Connector Pinouts
Kenwood ACC1 Connector pinout.
1. GND – Ground
2. TD – Transmit Data
3. RD – Receive Daya
4. CTS – Clear to send
5. RTS – Ready to Send
6. NC – No Connection (center pin)
Kenwood ACC2 connector pinout.
1. NC – No Connection
2. NC – No Connection
3. ANO – The receiver audio at a fixed level independent of AF gain control setting. Output voltage: 300mV /4.7Kohm or more at high input level
Continue reading Kenwood ACC2 Connector pinout
In the post before I’ve told you about the classic ALC problem that my TS850s also encounter. The solution was simple, R2 and R3 on the DC/DC board must be changed from 22K to 18K. The two resistors are SMD so it’s very hard to work on them that’s why my solution was to mount in parallel with those, ordinary non-SMD 100K resistors to reach the value around 18K as recommended.
Well now everything works just fine. I’ve got proper ALC reading on all band with 100W output without any problems.
Some materials about the Kenwood TS850s ALC Problem can be found here and here.
Damn, the old lady Kenwood TS850s is doing some problems again. I guess the ALC DC/DC Board is the problem. Above you can see a movie with the phenomenon. Must study….
Warning, I’m gonna show you some nasty pictures of my Kenwood TS850s.
Continue reading Kenwood TS850s inside Part Two
Here you have the microphone pinout of allmost every Kenwood transceiver. Be aware that there is a separate ground for the microphone and for the other functions. Don’t connect them together!
Nice transceivers, only … more than 10 years between them. 😀